package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*检查用户是否已经登录
 *@author 陈汝森
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")//把所有的请求路径都拦截
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
//        1、获取本次请求的URI
        String requestURI=request.getRequestURI();// /backend/index.html

        log.info("拦截请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //        2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

//        3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
//        4-1、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee" ));
//              获取线程id
            Long empId=(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

//             long id = Thread.currentThread().getId();
//             log.info("线程id为：{}",id);
            filterChain.doFilter(request,response);
            return;

        }
        //        4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user" ));
//              获取线程id
            Long userId=(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

//             long id = Thread.currentThread().getId();
//             log.info("线程id为：{}",id);
            filterChain.doFilter(request,response);
            return;

        }
     log.info("用户未登录");
//        5、如果未登录则返回未登录结果,通过输出流的方式向客户端页面响应数据
      response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
      return;

    }

    /**
     * 路径匹配，检查本次路径是否要放行
     * @param urls
     * @param requestURL
     * @return
     */
    public boolean check( String[] urls,String requestURL){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
          if(match){
              return true;
          }
        }return false;
    }

}
